Answer:
2:25
Explanation:
Magnet A and B are of equal magnetic strength and which position will magnets A&B have the greatest attraction for toward each other
Why was the Constitution written, according to the Preamble? A. to create a more perfect Union B. to end slavery C. to break free from Britain D. to give women the vote
what is one joule work
An atom with 7 protons, 6 neutrons, and 7 electrons has an atomic mass of _____ amu. (Enter a whole number.)
A compact car with a mass of 1,000 kg, traveling at 15 m/s, runs into and sticks to - an at-rest SUV of 2,200 kg. What is the final speed of the two cars? A. 4.7 m/s B. 67 m/s C. 2.2 m/s D. 147 m/s
Light from a distant star has undergone a red shift. Which of these conclusions is correct about the star? Its pitch is increasing. Its parallax is increasing. It is moving towards Earth. It is moving away from Earth.
Answer:
It is moving away from Earth.
Explanation:
As the source comes closer to the observer then we can say that its frequency will increase.
So here we know that
[tex]\frac{\Delta \nu}{\nu} = \frac{v}{c}[/tex]
here we know that
v = speed of the star
c = speed of light
now if we know that speed of the star is towards us then the frequency will increase and hence the wavelength will decrease.
So it is known as Blue shift
While if the star is moving away from us then in that case the frequency will decrease and hence the wavelength will increase.
So here it is known as Red Shift.
So here correct answer will be
It is moving away from Earth.
Suppose Eratosthenes’ results for Earth’s circumference were quite accurate. If the diameter of Earth is 12,740 km, what is the length of his stadium in kilometers?
Answer:
Length of one stadium = 0.1556 km
Explanation:
We have the diameter of Earth = 12740 km
Thus, circumference (C) of Earth is
[tex]=2\pi \frac{Diameter}{2} \\[/tex]
[tex]=2\times \pi \times \frac{12740}{2}[/tex]
C = 40023.89 km
Eratosthenes was a Greek polymath. He was the first to calculate the circumference of Earth. He had observed that at local noon on day of Summer Solstice, when Sun is overhead for the locations on Tropic of Cancer, a place named Syene had zero shadow day. Also on the same day the objects in Alexandria casts shadow. This proved that Earth is spherical and not flat. He went further and calculated the Sun angle ([tex]\theta[/tex]) for Alexandria by using a Rod (Gnomon). He found the angle to be about 7°. He also knew the distance (D) between Alexandria and Syene which was 5000 Stadia.
Lets say length of one stadia = S km
He used this data and simple concept of geometry as given below:
[tex]\frac{\theta }{360}=\frac{D}{C}[/tex]
[tex]=\frac{7}{360}=\frac{5000 \times S}{40023.89}[/tex]
[tex]=5000 \times S = \frac{7\times 40023.89}{360}[/tex]
[tex]=S = \frac{7\times 40023.89}{360\times5000}[/tex]
S = 0.1556 km
What best describes the degree to which a material can transmit heat
- melting point
- boiling point
- thermal conductivity
- electrical conductivity
The correct answer is C. Thermal conductivity
Explanation:
Conduction occurs as heat, electricity, etc. are transmitted from one body to another. In the case of thermal conductivity, this refers to the property of one material or body to transmit or conduct heat. This property is measured in Watts (energy) per meter(distance)-Kelvin (temperature). For example, the thermal conductivity of copper is around 385 while the one of ice is 1.6, which indicates copper has a higher capability to conduct heat. Thus, the degree to which a material can transmit heat is thermal conductivity.
What is the mass of an object that weighs 55N on earth?
With Earth's gravity being [tex]9.80 m/s^2[/tex] the mass is approximately 5.61 kg.
To calculate the mass of an object that weighs 55N on Earth, we need to use the formula for weight, which is w = mg, where w is weight, m is mass, and g is the acceleration due to gravity.
On Earth, g is typically [tex]9.80 m/s^2[/tex]
Therefore, we can find the mass of an object by dividing its weight by this acceleration due to gravity.
To calculate the mass (m) of an object that weighs 55N on Earth:
m = w / g
[tex]m = 55 N / 9.80 m/s^2[/tex]
This calculation results in a mass of approximately 5.61 kg.
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Describe an environment in which the sound of a ringing cell phone could not be transmitted, and explain why the ringing wouldn't be heard. Justify your reasoning using complete sentences.
Answer:
Explanation:
The sound of a ringing cellphone could not be transmitted or heard if the cellphone is enclosed in some sort of closed container from which the air has been removed. Sound is a mechanical wave, and so it must have some material substanceto travel through. Otherwise sound cannot travel from one place to another. The sound of the ringing could not travel through the vacuum inside the container if all the air were removed.
A boat sails along the shore. To an observer, the boat appears to move at a speed of 22 m/s, and a man on the boat walking forward appears to have a speed of 23.1 m/s. How long does it take the man to move 3 m relative to the boat?
Based on the diagram, which of these conclusions is correct? The frequency of Wave 1 is double the frequency of Wave 2. The frequency of Wave 2 is double the frequency of Wave 1. The wavelength of Wave 1 is four times the wavelength of Wave 2. The wavelength of Wave 2 is four times the wavelength of Wave 1.
Answer: The frequency of Wave 2 is double the frequency of Wave 1.
process where sediment and other material is moved from one place to another is called blank?
According to its periodic table entry, how many electrons does nitrogen have in its valence level? 2 5 7 14
please help me i will mark beainliest
Which would be the best element to use in a semiconductor?
Question 5 options:
lithium (Li)
chlorine (Cl) )
silicon (Si)
carbon (C)
What is the periodic table of elements?
Question 5 options:a chart that organizes all the elements by their atomic number a chart that organizes all the naturally-occuring elements a chart that organizes all the elements by their atomic mass a chart that organizes all the elements created by humansgive an example of fluid friction
PLEASE HELP ME!
C. What organelle is missing from E. coli?
Answer:
The organelle missing from E.coli is nuclear membrane.
Explanation:
A nuclear membrane is a double membrane that surrounds and protects the nucleus of a cell. The nuclear membrane is lacking because there is no need for one to protect a nucleus that does not exist. Bacteria cells are also prokaryotes, and all prokaryotes lack a nucleus.
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Which formula can be used to find tangential speed of an orbiting object?
Answer:
A) [tex]v = \frac{2\pi r}{T}[/tex]
Explanation:
As we know that the speed of the object is defined as the the ratio of total distance and total time taken
now as we know that here the distance along the path of the orbiting object is total length of the circle
so it is given as
[tex]L = 2\pi r[/tex]
also we know that
time period to complete the orbit is given as
[tex]t = T[/tex]
now the speed is given as
[tex]v = \frac{d}{t}[/tex]
[tex]v = \frac{2\pi r}{T}[/tex]
The farther a planet is from the sun, the _________ its orbital motion is, and the _________ the gravitational attraction between the planet and the sun is.
Question 4 options:
slower, weaker
slower, stronger
faster, weaker
faster, stronger
The orbital motion is slower and gravitational attraction is weaker.
What is Kepler's law of planetary motion ?
Kepler's law of planetary motion states that, the line joining a planet and the sun sweeps equal areas in equal intervals of time. That means, as the planet approaches the sun it speeds up and as it moves away from the sun, it slows down.
Here,
The planet is farther from the sun.
According to Kepler's law of planetary motion, the speed of this planet is decreasing. So, its orbital motion becomes slower and as the distance between the planet and the sun increases, the gravitational attraction between them also becomes weak.
Hence,
The orbital motion is slower and gravitational attraction is weaker.
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what is the wavelength of a wave?
A. the amount of time that one full cycle takes.
B. the distance from the beginning to the end of a cycle.
C. the amount of cycles that occur in a given time.
D. the distance traveled by the wave during one full cycle.
Calculate the acceleration of a car that begins at rest at a stop light and accelerates to a speed of 20m/s in a 10 sec time period. Be sure to include the acceleration formula and the final units.
please do the Venn diagram
When the moon is waning, what do we see?
A. none of the moon is visible
B. more and more of the moon
C. a full moon
D. less and less of the moon
Answer:
D. Less and less of the moon.
Explanation:
Waning has the meaning decreasing. A waning moon is the moon that decreases in size and its illumination . Moon starts waning a day after the full moon. Its size keeps decreasing and ultimately it is not visible on the new moon day .
A day after the new moon, it starts increasing in size and brightness and is slowly visible each night, until it is completely shining on the full moon day again. This is the waxing of the moon, where its size keeps increasing.
Which statement accurately describes what happens when water turns to steam in terms of energy?
A.The water absorbs energy which causes chemical bonds to break, changing water to steam.
B. The water releases energy which causes the water molecules to have less kinetic and potential energy, changing their configuration from liquid to gas.
C. The water releases energy which causes chemical bonds to break, changing water to steam.
D. The water absorbs energy which causes the water molecules to have more kinetic and potential energy, changing their configuration from a liquid to a gas.
C. The water releases energy which causes chemical bonds to break, changing water to steam.
PLEASE HURRY!!!
Answer:
D The water absorbs energy which causes the water molecules to have more kinetic and potential energy, changing their configuration from a liquid to a gas.
Explanation:
Good Luck ^^
The water absorbs energy which causes the water molecules to have more kinetic and potential energy, changing their configuration from a liquid to a gas. The correct option is D.
What is kinetic energy?The energy an object has as a result of motion is known as kinetic energy. A force must be applied to an object in order to accelerate it.
We must put in effort in order to apply a force. After the work is finished, energy is transferred to the item, which then moves at a new, constant speed.
Energy is absorbed by the water, increasing the kinetic and potential energy of the water molecules and converting them from a liquid to a gas.
Water molecules usually have the highest kinetic energy in the steam phase.
Thus, the correct option is D.
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1) What describes the unusually large release of plasma from the sun's corona?
Auroras
CME
Solar wind
Solar flare
__________________________________________________________________
2) The table below compares the distances between two bodies.
Comparison of Distance
Bodies Distance
X and Y 30.2 AU
Y and Z 7.2 light years
Based on the table, which of the following statements could be true?
X and Y are both within the solar system.
Y and Z are both within the solar system.
X and Y are farther apart than Y and Z.
Y and Z are both present on Earth.
_____________________________________________________________________
Answer:
CME
Explanation:
They right^ aced the test
From which sphere does most water evaporate?
A. Lithosphere
B. Hydrosphere
C. Biosphere
D. Atmosphere
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1. What is the force on an object due to its mass and gravity called?
A)Kilograms
B)Velocity
C)Weight
D)Pounds
2. Which of the following best describes gravitational force?
A)An attraction between two objects that have mass
B)An attraction between two objects due to their electrons
C)The force that keeps atoms and molecules bound together
D)The force that keeps objects from moving when they are at rest
3. How does distance between two objects affect their gravitational force?
A) Force increases as distance increases.
B)Force decreases as distance increases.
C)Force decreases as distance decreases.
D)Force is not related to distance.
4. Imagine you are an astronaut and you travel to a planet with a much larger mass than Earth. How would this affect your weight? Explain your answer.
C)Weight
A)An attraction between two objects that have mass
B)Force decreases as distance increases.
grav force of massive planet increases your weight
Answer:
C)Weight
A)An attraction between two objects that have mass
B)Force decreases as distance increases.
Explanation:
what is the shape of the orbit of satellites
Answer:
The shape will be elliptical hopefully this helps!